I posted here because everyone has mixed opinion on this. ITS says the new turbos have them built in and other people say its a good idea to install one since oil pressure can reach 90+psi. This damn internet, it confuses everyone!!
you dont need one for dbb they are built in. The standard bearing does not need one also. DBB turbos do not require a lot of oil. I have a -4 fitting and I welded it up and put a small size drill bit through there. That reduces my flow into the turbo. You can do that or run a -3an line and be fine.